Gemini 3.5 Flash Cyber and Devstral 2 (123B) don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Devstral 2 (123B) shipped 224 days before Gemini 3.5 Flash Cyber, so benchmark comparisons should account for the intervening progress.

Gemini 3.5 Flash Cyber is proprietary, while Devstral 2 (123B) is open weight.

Direct benchmark comparisons are unavailable — Gemini 3.5 Flash Cyber and Devstral 2 (123B) don't publish scores on any of the same benchmarks.